Descriptive Geometry (Classic Reprint) - Tapa blanda

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Excerpt from Descriptive Geometry

One of the principal factors in accomplishing these desiderata is the omission of the ground line. When the views of several points are given without the ground line being shown, the dis tances of the points from the horizontal or vertical planes of projection are not' determined. The front view, however, does show the relative heights of the points and the top view shows the relative distances of the points from the vertical plane. It is the relative distances of points of an object from a plane with which we are concerned, since the distance of the whole object from the plane of projection does not change the ortho graphic projection of the object on that plane.

When it becomes necessary to locate points which are at given distances from the planes of projection the ground line must of course be used. In all cases, however, even when the ground line is not shown on the drawing, it is understood to be at right angles to the line joining the top and front views of any point.

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